Sack severing or perforating means for cement mixers



Oct. 5, 1937. c. E RICH ET AL 2,094,818

SACK SEVERING 0R PERFORATING MEANS FOR CEMENT MIXERS Filed March 18, 1955 2 Sheets-Sheet 1 H (vaaae EJ211273 07am eslfifjiz'ttin gfaru I INVENTOR @ZNEY Oct. 5, 1937. c. E. RlcH ET AL SACK SEVERING OR PERFORATING MEANS FOR CEMENT MIXERS 2 Sheets-Sheet 2 Filed March 18, 1955 v o o o o A v o o o o u\((( HIKE/k Nu mumhud INVENTOR ATTORNEY UNITED STATES PATENT OFFICE SACK SEVERING OR PERFORATING MEANS FOR CEMENT MIXERS Claude E. Rich and JamesP. Whittington, Longview, Tex.

Application March 18, 1935, Serial No. 11,628

4 Claims. (Cl. 214-4) This invention relates to certain new and usemovable frame, sliding support therefor, with the ful improvements in wellcementing equipment, hopper.

and it has particular reference to apparatus Figure 5 is an end elevation of. the mixing hopused in conjunction with cement mixing apper showing the driving means for the invention.

5 paratus for perforating or severing sacks pre- Figure dis a detailed view of the eccentric or 5 paratory to the introduction of cement into the shaker arm, and hopper of the mixing apparatus. Figure '7 is a detailed view of the sack perforat- The principal object, of. the invention is to proing means per se, broken to show extension. vide automatic means for perforating sacks in Continuing with a more detailed description such manner that when slightly elevated from of the drawings, I designates the barrel or mix- 10 this means, the material of the sack will break ing chamber of the conventional type of cement or tear between the perforations by the weight mixing apparatus, and while it is not shown, a of the contents and the latter will fall into the form of agitating element is disposed. within this mixing apparatus. The invention provides that barrel for thoroughly mixing the cement with there will be practically no waste of cement and water and for conveying the mixture to a point 15 eliminates the arduous task of severing the sacks of discharge. This agitator is carried upon a manually by a knife or by dragging the sack shaft 2, which is operated by a sprocket wheel 3 manually across a stationary knife or severing by which the shaft is driven. A sprocket wheel means. The methods named are conventional 4 is likewise mounted upon the shaft 2, surroundand it is obvious that the knives must be maining which is a chain 5, the latter encircling a 20 tained in a sharpened condition at all times, sprocket wheel 6, mounted on a shaft I.

whereas in the case of the present invention, The shaft 1 passes through the throat 8 of the sharpening of the sack severing medium is selhopper 9, and upon each end of the shaft is dom if ever required. mounted a sprocket wheel Iii. Adjacent to the g5 Broadly, this invention is to provide means asmouth of the hopper 9 there is provided a shaft sociated with the hopper of. a cement mixing ap- II, the ends of which overreach the edges of paratus which will likewise dispense with the the hopper and carry sprocket wheels I2. A usual platform upon which the sack is initially chain I3 surrounds each of the sprocket wheels w deposited preparatory to ripping the sack where- II] and I2. It is apparent therefore that when upon it is moved over the hopper and the conthe agitator shaft 2 is rotated, shafts 'I and I I 30 tents of the sack deposited therein. The presrotate in unison through the medium of the ent invention provides that the sack of cement chains 5 and I3. The shaft 7 carries a rotary be placed directly onthe perforating or severing member I4, shown fragmentarily onlyin Figmeans which is situatedin the hopper and by ure 3. This member is of conventional design which it is immediately perforated, preparatory and operates in the capacity of a valve to nor- 35 I to emptying its contents. Fragments of the sack, mally close the throat of the hopper and to proif there be any, are prevented from entering the portion or control the cement deposited in the cement by a suitable frame and which frame is hopper 9 as it passes into the mixing chamber I. readily removed from the hopper. Situated within the hopper 9 adjacent the 40 With the foregoing objects as paramount, the mouth thereof is a pair of angle iron slides or invention has particular reference to its salient tracks I5. These slides are fixed to the walls features of. construction and operation, to beof the hopper and preferably extend at right come manifest as the description proceeds, taken angles to the longitudinal axis of the mixing in connection with the accompanying drawings, chamber I, wherein:- A frame It, likewise preferably constructed of 45 Figure 1 is an elevational view of one form of angle iron is slidingly disposed on the tracks I5, cement mixing apparatus, with portions broken and since it is necessary that the frame I6 reaway, and showing the invention attached. ciprocate, its width is less than that of the hop- Figure 2 is a plan View of the hopper of the per, but only slightly so since the extent of dismixing apparatus showing the invention thereon. placement need be but a small amount, as will 5 Figure 3 is a fragmentary view in vertical secbecome apparent presently. tion, showing a hopper with the sack perforating The frame It has intercrossing wires I'I exmeans of the invention therein. tending from one side to the other as shown in Figure 4 is a fragmentary detailed view partly Figures 2 and 3. This frame rests upon what 55 in section showing the relationship of the rewill be referred to as a shaker frame I8, a detail of angle iron straps l9, between each of which.

is secured the ends of a sack perforating means 20, shown in detail in Figure '7. It will be noted particularly in Figure 3 that the upwardly eX- tending serrations of the blade 20 lie below the top of the hopper 9.

view of safety to the operators of the machine.

Reciprocation of the perforating element 20 is rapid and is obtained through the medium'of the eccentric arm 2! shownin detail in Figure,

6 and on the end of which is an eccentric'22, the latter being afiixed to the shaft II. .To the opposite end of the arm 22.is affixed a pin 23, disposed at right angles to the longitudinal axis of the arm 2! and whichenters a slot 24, one of which is provided on the wall on each side of the hopper 9; ;A corresponding slot 25 must also be made in the stationary slides or tracks 15 Within the hopper. is shown in Figure 4. After passing through slots 24 and 25, the pin 23 is welded or otherwise suitably secured to the shaker frame l8.

From the foregoing it will be seen that rotation of the shaft II will impart to the arms 2i on either side of the hopper a pitman effect which will in turn impart to the shaker frame 18 a reciprocatory movement, the speed of which may be determined by the ratioof the sprockets it and I2 or other driving means which may be adopted in substitution thereof. 7

Inoperation, a sack. of cement is placed upon the sack perforating element 28, usually by two operators standing on either side of the hopper. Obviously, the rapidly moving element 2Q will instantly perforate the material of the sack and when the latter is lifted the weight of the contents -will break the sacks between the perforations and will be deposited into the hopper. The sack is then disposed of. Should any fragments of the sack tend to fall within the hopper, they are intercepted by the screen comprised of the intercrossing wires ii. The frame it of the screen may be readily removed and any material intercepted thereby disposed of with but little delay in the operations. Even if fragments of the sack or other material of a similar nature should enter the hopper, this is of little consequence but it is'desirable that the material be prevented from entering with the cement, hence the provision of the removable screen.

:The simple form of securement of the sack perforating element 20 to the frame 26 is such that in the event it becomes dull and will not 1 readily sever the sacks, a new or sharpened element may be installed in a minimum of time and with but little delay in the operations of cementing a well. These provisions are made for expedition since the job of cementing a well must This particular positioning of the perforating element is 'made with a a This particular arrangement usually be carried out in haste and it is desirable to relieve workmen of the usually arduous task of handling the sacks of cement by eliminating certain operations previously required in conveying the cement to the hopper. One of these operations consisted of first elevating the sack to a platform and slitting the same manually with a knife or by sliding the sack across a stationary knife extending above the platform :or across-the-hopper mouth. The present invention requires only that the sack be placed directly on. the hopper where it is instantly severed and the contents deposited into the hopper. I V

Another advantage apparent in the present invention is'that the screen is effective in break- 7 ing up balledmasses of cement, caused by allowing the same to be exposed to dampness.

Manifestly, the construction shown and described is capable of considerable modification and such modification as is considered within the scope and meaning of. the appended claims is also considered Within the spirit and intent of the invention.- 7

W e claim: v o

1. In combination with the hopper of an apparatus for mixing cement, a cement sack perforating means comprising a frame capable of reciprocation and disposed to completely surround the mouth of said hopper, an elongated serrated member in fixed relation to said frame, and extending across the mouth of said hopper, a screen below said serrated member and means for imparting reciprocation to said frame.

2. In combination with the hopperof a cement mixing apparatus, a sack severing means including arectangular frame whose sides lie within and are equidistantly spaced from the walls of said hopper and'capable ofehorizontal reciprocation and carrying a sack severing blade, said blade having an upturned serrated edge and havingits ends connected to opposite sides of said frame, a screen below said blade and means for reciprocating said frame.

3. In combination with the hopper of a cement mixer a sack severing means including a horizontally movable frame disposed in said hopper and whose sides are equidistantly spaced from the inner walls of said hopper, a blade affixed transversely across said frame, a screen horizontally disposed below said blade and means for actuating said frame.

.4. In combination with the hopper of a cement mixing app'aratus, a sack cutting means comprising a reciprocating frame lying within said hopper whose sides are equidistantly spaced from the inner walls of said hopper, said frame having a blade affixed thereto for movement therewith, 

